| \small{(Top row) Spectra of the mass difference, $M(\Lb\pim)-M(\Lb)-m_{\pim}$ for $\Xibm\to\Lb\pim$ candidates, for the (left) $\Lb\to\Lc\pim$ and (right) $\Lb\to\Lc\pim\pip\pim$ samples, with the tight BDT2 selection. The bottom row shows the corresponding distributions for the wrong-sign candidates. Fits to the data are overlaid as described in the text. } |